Emergency services are responding to a truck fire on the Hunter Expressway at Greta.

According to the NSW Rural Fire Service, the incident was reported approximately five minutes ago. The fire is currently listed as not yet under control.

The blaze has been recorded as a truck fire, with crews working at the scene. No information has been released regarding injuries or traffic impacts at this stage.

Motorists travelling through the area are advised to exercise caution and follow directions from emergency services.

More information will be provided as it becomes available.